Carburetor housing and air inlet arrangement



Jan. 4, 1955 s o 2,698,743

CARBURETOR HOUSING AND AIR INLET ARRANGEMENT Filed April 11, 1950 2 Sheets-Sheet -1 1 JHV HL 0F Razz}: 56110]! Jan. 4, 1955 F. SEBOK 2,698,743

CARBURETOR HOUSING AND AIR INLET ARRANGEMENT Filed April 11, 1950 2 Sheets-Sheet 2 ZHVEJYL UT z 7 fi azzlt fiebojz 52% Z/WLLFE United States Patent CARBURETOR HOUSING AND AIR INLET ARRANGEMENT Frank Sebok, Detroit, Mich., assignor to Houdaille- Hershey Corporation, Detroit, Mich., a corporation of Michigan Application April 11, 1950, Serial No. 155,163

1 Claim. (Cl. 261-1) This invention relates to improvements in carburetor housing and air inlet arrangements highly desirable for use in connection with the carburetor of internal combustion engines of the automotive type, although the in vention will have other uses and purposes as will be apparent to one skilled in the art.

In the past, it has been common to provide a relatively heavy casting held in place with a number of elongated bolts or the like as a housing for a carburetor. Such casting would have a specially constructed horn thereon to which it was necessary to connect the clean air outlet tube from an air cleaner, an intake silencer, or a combination of both, by means of an expensive clamp requiring care and caution in its attachment in order to insure an air tight connection between the outlet or supply tube and the carburetor intake horn. Obviously such an arrangement was objectionably expensive, and in view of the later design in automobile engines and design of the hood of an automobile, the arrangement occupied entirely too much room beneath the hood. Very little space is now allowed for positioning any intake connection to a carburetor, and that is especially true in connection with downdraft carburetors of the type now mostly used.

With the foregoing in mind, it is an important object of the instant invention to provide carburetor housing and air inlet arrangement which eliminates the need of any clamp connection to a carburetor air intake horn, and which may be disposed substantially as low as possible over a downdraft carburetor.

Also an object of this invention is the provision of a housing for a carburetor, which housing may be in the form of a simple sheet metal stamping.

A further object of the invention resides in the provision of an extremely light weight and economical housing for a carburetor which may be attached to the carburetor with the aid of a single fastening element.

Another feature of the invention resides in the provision of a carburetor housing and air intake arrangement, which may not only be readily and easily connected to a carburetor in lieu of the customary cast housing, but which may also be readily connected or associated with an air cleaner, an intake silencer, or a combination of both, and which arrangement occupies a minimum of space over the carburetor which is especially desirable when utilized beneath the hood of an automobile.

It is also a feature of this invention to provide a carburetor housing and air intake arrangement including a relatively thin sheet metal casing having an air supply conduit permanently connected therewith to deliver air into the casing adjacent the top thereof.

Still another object of the invention resides in the provision of a simple economical carburetor intake arrangement which insures an even distribution of air to the carburetor, especially since the casing functions as the housing for the carburetor.

While some of the more salient features, characteristics and advantages of the instant invention have been above pointed out, others will become apparent from the following disclosures, taken in conjunction with the accompanying drawings, in which- Figure l is a fragmentary plan view of a housing and air intake arrangement embodying principles of the instant invention, showing the same associated with a downdraft carburetor;

Figure 2 is an enlarged fragmentary vertical sectional view, with parts in elevation, taken substantially as Patented Jan. 4, 1955 indicated by. the line II-II of Fig. 1, looking in the direction of the arrows;

Figure 3 is a view similar in character to Fig. 1, but showing a slightly different form of the instant invention; and

Figure 4 is a fragmentary enlarged vertical sectional view of the character of Fig. 2, taken substantially as indicated by the line IVIV of Fig. 3.

As shown on the drawings:

Both illustrated embodiments of the instant invention are shown associated with the same form of downdraft carburetor. The carburetor selected for illustrative purposes is of a type supplying a V-8 engine, the carburetor therefore having two discharge ports, each to certain cylinders of the engine. It is to be understood, however, that the invention may equally as readily be associated with substantially any form of carburetor, and especially one having only a single discharge opening, a single throttle valve, a single choke valve, etc. Except for the parts necessary to discuss to properly point out the instant invention, the carburetor has been illustrated rather diagrammatically and will be rather briefly described.

This carburetor includes a base portion 1 which may be connected to an internal combustion engine in a known manner. Through this base portion are separate mixing chambers 2 and 3 from which fuel mixed with air may exit into the engine, the outflow of the combustion mixture being controlled by suitable throttle valves, not shown in the drawings. Entrance of fuel and air into the mixing chambers 2 and 3 is controlled by means of suitable choke valves 4 and 5, respectively, both of which are connected for operation to the same shaft 6, which may be either manually or automatically actuated. Above the base portion 1 is a suitable structure 7 containing the carburetor float chamber from which liquid fuel is delivered to the mixing chambers 2 and 3 by way of discharge pipes 8 and 9, respectively. Adjacent the float chamber is a suitable structure 10 containing the customary accelerator pump.

Upstanding from the float chamber structure is a bolt 11 which is threaded at its outer end to accommodate a wing nut 12 or the equivalent.

Owing to the open condition of the ports controlled by the choke valves 4 and 5 and the open lower ends of the liquid fuel pipes 8 and 9, the entire upper portion of the carburetor must be enclosed by a housing. Heretofore, that housing was commonly in the form of a heavy casting held in place by numerous bolts, and equipped with an air horn to which an air supply conduit had to be connected by way of a special clamp. The present invention, of course, eliminates any such cumbersome and expensive structure.

At the upper part of the carburetor base is a housing support flange 13, preferably circular for purposes of economy, although it may have any desired contour. This flange is recessed in its upper and outer marginal portion to accommodate an annular gasket 14. It will be seen therefore that all the elements 1 through 10, and 13 are permanent parts of the carburetor and parts shown but not described attach the elements 7 and 10 to the flan e or platform 13.

With reference now to that embodiment of the invention seen in Figs. 1 and 2, it will be noted that the housing and air intake arrangement embodies a casing 15 which is preferably in the form of a simple sheet metal drawing or stamping. At least the lower portion of the casing 15 has a contour complemental to that of the supporting flange 13, this lower end being open to receive the upwardly extending parts of the carburetor, and the lower marginal portion of the casing around this opening is shaped to provide an outwardly and downwardly stepped flange 16.

Obviously, the flange 16 need not conform exactly or have an exact and fine fit with the outer edge of the supporting flange 13, because the horizontal portion of the flange 16 rests upon the gasket 14 and an air tight seal is readily effected.

The top part of the casing 15 is recessed and flattened as indicated at 17, and the flattened part is provided with a suitable aperture through which the aforesaid bolt 11 may extend. When the wing nut 12 is tightened down exteriorly of the casing 15, to press the flange 16 against the gasket 14, the carburetor structure is readily, easily, and thoroughly housed. No other securing means except the single bolt 11 is necessary to hold the simple form of housing in position on the carburetor.

An air supply conduit 18 enters the casing preferably near the top thereof, and is also preferably permanently secured to the casing as by brazing, spot welding or in an equivalent manner, as indicated at 19.

This air supply conduit may be readily associated with any other form of apparatus generally indicated by numeral 20, and the casing 20 may be that of an air cleaner, an intake silencer, or a combination air cleaning and intake silencing unit. In fact, the supply conduit 18 may be permamently secured to the casing 20 so as to be an integral part of the air cleaning, silencing or combination apparatus, thereby making the housing 15 also an integral part of that apparatus, if such should be desired. With the conduit leading into the casing 15 adjacent the top of the latter, a more even and uniform supply of air is provided for the carburetor.

It will be especially noted that the casing 15 may be constructed to seat as low as possible over the carburetor, substantially down to the top of the accelerating pump 10, if so desired and if so required by the limited room beneath the hood of an automobile.

By way of the simple invention hereinabove described, it will be noted that a heavy cast carburetor housing with its numerous attaching bolts has been eliminated, the provision of the air horn has been eliminated, and a special clamp and the necessity of utilizing it to join an air supply conduit with the carburetor horn has been eliminated. In lieu thereof we have a highly simplified and economical structure which just as effectively performs the function of a carburetor housing.

In that embodiment of the invention illustrated in Figs. 3 and 4, we have identically the same carburetor construction as above described. The housing, in this instance designated 15a, is also preferably a simple form of sheet metal drawing or stamping. This housing is provided with the above described flange 16 around its lower open end for seating engagement with the gasket 14 on the carburetor supporting flange 13.

In this instance, however, the air supply conduit is in the form of an elbow 21 and enters the housing 15a centrally through the top thereof, where it is afiixed to the housing as indicated at 22. By virtue of the elbow entering directly through the top of the housing, the securing bolt carried by the carburetor must need to be longer than the above described bolt 11, as illustrated at 11a. The top portion of the elbow-like conduit 21 is recessed and flattened as indicated at 23, there being an aperture through the flattened portion to receive the upper end of the bolt, so as to provide suitable engagement for the wing nut 12.

The free end of the elbow conduit 21 may be associated with the casing 24 from an air cleaner, a carburetor silencer, or a combination unit as may be desired. It will be understood, of course, that both conduit 21 and the previously described conduit 18, if associated with a silencer, may extend well therein and function as a tuning tube.

While the structure of Figs. 3 and 4 may not be disposed as low over a carburetor as the structure of Figs. 1 and 2, owing to the curvature of the air supply conduit 21, the structure is nevertheless just as simply associated with the carburetor and is as effective in functioning as a housing for a carburetor and in supplying air to the carburetor. The structure of Figs. 3 and 4 possesses one slight advantage over the structure of Figs. 1 and 2, in that an absolutely uniform supply of air is furnished the carburetor.

It will be understood that modifications and variations may be effected without departing from the scope of the novel concepts of the present invention.

I claim as my invention:

In a sound attenuating and housing structure for an engine a carburetor which includes a base support with a carburetor thereon having engine fuel supply means discharging above the support, a housing comprising the sole closure for the carburetor and including a single piece stamping of relatively thin sheet metal in the general.

shape of an inverted cup directly over and encompassing the carburetor and cooperating with the support to define a closed fuel chamber in which the fuel is discharged, said housing having a lower marginal flange sealingly cooperating with said support, a sealing gasket on said support cooperating with said housing marginal flange, a single sound silencer conduit leading into the upper part of said housing and through which air is supplied to the interior of the housing, said housing being completely closed with the exception of the conduit opening therein and together with said conduit providing a completely closed path for the sound attenuation of sound waves emanating from an engine with which the carburetor is associated and means to secure the housing over and closely spaced from the carburetor and in sealtight cooperation with said gasket.

References Cited in the file of this patent UNITED STATES PATENTS Carter Jan. 30, 1934 Kamrath Feb. 9, 1943 

